Hastelloy C4 Pipe Supplier in China
Hastelloy C22 tubing is a high-performance,fully austenitic nickel-chromium-molybdenum-tungsten superalloy piping solution designed for exceptional corrosion resistance.This specialized tubing outperforms standard stainless steel and other nickel alloys in highly corrosive chemical environments.
Hastelloy C22 Equivalent Designations
- UNS N06022
- W.Nr. 2.4602
- EN NiCr21Mo14W
- AFNOR NC 20 FeMo
- AFNOR NU-30M
Hastelloy C22 Pipe Standards
- ASTM B622 / ASME SB622
- ASTM B619 / ASME SB619
- ASTM B626 / ASME SB626
- ASTM B564 / ASME SB564
- ASTM B575 / ASME SB575
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Chemical Composition of Hastelloy C22 Pipe, wt.%
| Element | Min | Max | Primary Role in the Alloy |
|---|---|---|---|
| Ni | Balance | Provides the base matrix,high ductility,and excellent resistance to chloride-induced stress corrosion cracking. | |
| Cr | 20.0 | 22.5 | Delivers exceptional resistance to heavily oxidizing environments (e.g., nitric acid, wet chlorine, ferric salts). |
| Mo | 12.5 | 14.5 | Protects the metal from localized reducing environments, heavily suppressing pitting and crevice corrosion. |
| W | 2.5 | 3.5 | Works synergistically with Molybdenum to further optimize resistance to localized pitting attacks. |
| Fe | 2.0 | 6.0 | Included primarily as a stabilizing element and a byproduct of structural economy during primary melting. |
| Co | – | 2.5 | Enhances structural and thermal stability, while preventing rapid work-hardening during processing. |
| C | – | 0.015 | Kept ultra-low to completely prevent grain-boundary carbide precipitation during the welding process. |
| Mn | – | 0.50 | Acts as a deoxidizer and controls sulfur impurities during the initial manufacturing melt. |
| Si | – | 0.08 | Controlled strictly to low levels to maximize weld pool fluidity without degrading localized corrosion resistance. |
| S | – | 0.02 | Kept at minimal trace levels to guarantee hot workability and eliminate weld-cracking risks. |
| P | – | 0.02 | Maintained as an ultra-low impurity to secure structural cleanliness and prevent brittleness. |
| V | – | 0.35 | Added in trace amounts to control grain size growth during high-temperature thermodynamic treating. |
Mechanical Properties of Hastelloy C22 Pipe
Room Temperature Mechanical Properties
| Mechanical Property | Tensile Strength | Yield Strength | Elongation | Hardness |
|---|---|---|---|---|
| Minimum Specification Limit | ≥ 690 MPa(100 ksi) | ≥ 310 MPa(45 ksi) | ≥ 45% | ≤ 100 HRB |
| Typical Range | 690 – 800 MPa(100 -116 ksi) | 310 – 450 MPa(45 – 65 ksi) | 45 – 60 % | 89 – 100 HRB |
High-Temperature Tensile Performance
When exposed to thermal loads inside chemical reactors or heat exchangers,the alloy undergoes gradual thermal softening.However,its high molybdenum and tungsten matrix keeps structural degradation low. Typical elevated-temperature values for solution-treated material include:
- At 316℃ (600℉):
Yield Strength: ~ 42 ksi (286 – 290 MPa)
Tensile Strength: ~ 98 ksi(676MPa)
Elongation: ~ 62% - At 538℃ (1000℉):
Yield Strength: ~ 34 ksi (234 – 276 MPa)
Tensile Strength: ~ 88 ksi(607 – 627 MPa)
Elongation: ~ 61 – 67%
Applications of Hastelloy C22 Pipe
- Hazardous Waste Water Treatment
- Chlorination and Bleach Systems
- Acetic Acid Production Plants
- Pharmaceutical Reaction Vessels & Piping
- Flue Gas Desulfurization
- Agrochemical & Pesticide Manufacturing
- Desalination Plant Heat Exchangers
- Sour Gas Flare Lines
- Cellulosic Biofuel Processing
- Subsea Oil & Gas Flowlines
FAQs About Hastelloy C22 Pipe
Yes.Hastelloy C22 pipes can be welded to dissimilar metals like 316L stainless steel pipes,duplex stainless steel,or carbon steel.
- Filler Metal: You must use an over-alloyed filler metal, typically Alloy 622 (ERNiCrMo-10) wire or EniCrMo-10 electrodes.
- Precaution: Galvanic corrosion can occur in the less noble stainless steel side if the process fluid is highly conductive and aggressive.
No.Unlike earlier nickel alloys or carbon steels,Hastelloy C22 tubing is ready for service immediately after welding.Its ultra-low carbon content prevents the formation of dangerous intergranular carbides during welding.Performing standard stress-relief heat treatment may actually induce the formation of brittle intermetallic compounds (Sigma/Mu phases) and reduce corrosion resistance.If structural heating is necessary,full solution annealing should be performed at 2050°F,followed by rapid water quenching.
- ASTM B622:Seamless Pipe & Tube.
- ASTM B619:Welded Pipe.
- ASTM B626:Welded Tube.
- ASME SB-622/619/626:Standards for Pressure Vessels.
- Hydrochloric Acid:
C22 offers excellent resistance to dilute HCl at moderate temperatures.However,for highly concentrated boiling HCl,specialized alloys like Hastelloy B3 perform better. - Sulfuric Acid:
C22 provides superb resistance across a wide range of concentrations at temperatures up to 150℉.It is particularly effective in sulfuric acid streams that are contaminated with oxidizing impurities (like ferric ions or dissolved oxygen),where other alloys fail.
The high cost stems directly from its elemental composition and manufacturing complexity:
- Raw Materials:
It contains over 56% pure Nickel,along with high percentages of expensive Molybdenum,Chromium,and Tungsten. - Processing Costs:
The alloy work-hardens rapidly and has high hot-strength,making extrusion,drawing,rolling,and machining incredibly energy-intensive and abrasive to factory tooling.
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